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Finding the Fourth Proportional to 890.51, 1,228.91 and 517.50

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Solution

The fourth proportional to 890.51, 1,228.91 and 517.50 is: 714.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    890.51 : 1,228.91 = 517.50 : x
  2. Step 2: Convert to fraction form
    890.51/1,228.91 = 517.50/x
  3. Step 3: Cross multiply
    890.51x = 1,228.91 × 517.50
  4. Step 4: Simplify right side
    890.51x = 635,958.34
  5. Step 5: Solve for x
    x = 635,958.34/890.51
  6. Step 6: Final answer
    x = 714.15

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.